A food shortage occurs when the supply of food in a region falls below the demand needed to feed its population. This can range from temporary empty shelves at a grocery store to prolonged, widespread hunger affecting millions. In 2024, more than 295 million people across 53 countries experienced acute levels of hunger, an increase of nearly 14 million from the year before.
Food shortages are not the same as food insecurity, though the two overlap. A shortage refers to the physical availability of food, while food insecurity is the broader economic and social condition of not having reliable access to enough of it. You can live in a place with fully stocked stores and still be food insecure if you can’t afford what’s on the shelves.
How Severity Is Measured
International organizations use a five-phase scale called the Integrated Food Security Phase Classification (IPC) to describe how bad things are in a given area. Phase 1 is minimal, meaning most people can meet their food needs. Phase 2, “Stressed,” means households are starting to cut back on food quality or sell off assets. Phase 3, “Crisis,” indicates people are actively going hungry and depleting their resources to survive. Phase 4 is an emergency, with widespread acute malnutrition. Phase 5 is catastrophe or famine, where starvation and death are occurring at scale.
The USDA uses its own categories within the United States. “Low food security” means people are eating less varied or desirable diets but not necessarily eating less overall. “Very low food security” means disrupted eating patterns and reduced food intake, the level at which physical hunger becomes a regular experience.
What Causes Food Shortages
Climate and Weather Extremes
Rising temperatures are one of the most significant long-term threats to food production. By the end of this century, average summer temperatures in the tropics and subtropics are projected to exceed the hottest summers ever recorded in those regions, where roughly half the world’s population lives. But the damage isn’t waiting for 2100. The 2003 European heat wave reduced France’s fruit harvest by 25%. In 2006, extreme weather across the Murray-Darling Basin in Australia contributed to a drop in global cereal production.
Heat also creates secondary problems. Warmer conditions expand the range of crop pests and plant diseases, which can increase the need for pesticides and fungicides. Certain toxic molds that grow on crops, including some that produce aflatoxins, thrive as temperatures rise toward their optimal range. Climate change also increases irrigation demand, with estimates suggesting a 5 to 8 percent global increase in crop water needs and up to 15 percent in Southeast Asia.
Armed Conflict
War destroys farmland, damages infrastructure, and displaces the people who work it. Ukraine, long considered a major granary for Europe and the broader world, illustrates this clearly. Since the armed conflict began in 2022, fighting across Ukraine’s eastern and southern regions has directly damaged arable land and disrupted critical stages of farming like fertilization and irrigation. At least 6.5 million refugees fled the country, creating a severe shortage of agricultural labor and leaving fields unplanted.
The ripple effects reached far beyond the region. Lower- and middle-income countries were disproportionately affected as global grain trade networks fragmented. Counterintuitively, countries geographically distant from Ukraine experienced greater disruptions than neighboring nations, because nearby countries could more easily reroute supply chains. The war drove up global agricultural import prices and reshaped trade flows, with some analysis finding that Russia actually gained market share as Ukrainian exports dropped.
Supply Chain Fragility
Modern food systems operate on a “just-in-time” model, keeping inventory levels as low as possible to reduce costs. This works well under normal conditions but creates extreme vulnerability when anything goes wrong. As one Wharton supply chain expert put it, when reducing inventory becomes the only goal, “it creates unprecedented levels of unpreparedness.” Companies become easily blindsided by disruptions, whether that’s a pandemic, a severe weather event, or a spike in demand for a single commodity. Even Toyota, the company that pioneered just-in-time manufacturing, announced it was pulling back from the model after recent disruptions exposed its risks.
Price Spikes
Sometimes food exists but costs too much for people to buy it. The FAO Food Price Index, which tracks international prices for a basket of staple foods, shows ongoing volatility across categories. Vegetable oils sat more than 10 percent above their level from a year earlier in early 2026, driven by rising palm, soy, and sunflower oil prices. Meat prices were up about 6 percent year over year. Rice prices climbed nearly 2 percent in a single month on stronger demand. When these increases compound across multiple food categories, they can tip vulnerable populations from food security into crisis.
What Happens to the Body
When people don’t get enough calories over an extended period, the body begins rationing energy. Metabolic rate drops. Core body temperature falls, even by fractions of a degree. Thyroid hormone levels decrease as the body tries to conserve resources. Insulin levels can drop by nearly 30 percent. The body loses both fat and lean tissue, with fat mass declining by around 24 percent and fat-free mass (muscle, organ tissue) dropping by about 4 percent in studies of sustained caloric restriction.
The psychological toll is equally significant. The landmark Minnesota Semi-Starvation study, one of the most detailed investigations of prolonged hunger, found that caloric restriction significantly worsened mood, concentration, and overall quality of life. People became irritable, anxious, and obsessed with food. These mental health effects compound the physical damage and can persist even after food becomes available again.
Children Bear the Greatest Cost
An estimated 45 million children under five are wasted (dangerously underweight for their height) worldwide, with more than half living in South Asia. The numbers are worse than a single snapshot suggests: while about 5.6 percent of children are wasted at any given checkup at age two, roughly 29 percent have experienced at least one wasting episode by that age, and 10 percent have experienced two or more.
In South Asia, where low birthweight is common, nearly 19 percent of newborns already show signs of wasting at birth, driven by maternal malnutrition and poor fetal growth. Children wasted before six months tend to recover faster, but early wasting raises the risk of later growth problems, including concurrent wasting and stunting (being too short for their age). About 10.6 percent of children experience both conditions simultaneously before turning two. This combination is particularly dangerous: it increases mortality risk and is linked to impaired brain development that can affect cognitive function for years.
Building More Resilient Food Systems
One of the most promising approaches to preventing shortages at the production level is regenerative agriculture, a set of practices designed to improve soil health and make crops more resilient to environmental stress. The core techniques include eliminating or reducing tillage, planting cover crops between harvests, growing perennial crops, and diversifying what’s planted through more complex crop rotations.
The practical benefits are measurable. No-till farming improves water infiltration into soil, which can boost yields during dry growing seasons. Research across 20 locations in North America found that more diverse crop rotations produced higher corn and soybean yields, with the biggest gains showing up during stressful growing seasons, exactly when they’re needed most. These methods can also reduce input costs, since healthier soil requires less synthetic fertilizer and irrigation. The appeal is straightforward: farms that can absorb climate shocks without collapsing produce more reliable food supplies for everyone downstream.